Markov, O., O. Gerasimenko, A. Khvashchynskyi, R. Zhytnikov, and R. Puzyr. “Modeling the Techological Process of Pipe Forging Without a Mandrel”. Eastern-European Journal of Enterprise Technologies, vol. 3, no. 1 (99), May 2019, pp. 42-48, doi:10.15587/1729-4061.2019.167077.